The least common multiple is a pretty simple process. We do this by writing down each number, and multiples of them, like this:
2 - 4, 6, 8, 10, 12
4 - 8, 12
6 - 12
Now the least common multiple is the first number that these sets share, which we see is 12, so that is the LCM (least common multiple) of these numbers.
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18
The LCM is 24.
The answer is 42. 6 x 7 equals 42. 21 x 2 equals 42.
Since 4 is a multiple of 2, it is automatically the LCM.
Since 4 is a multiple of 2, it is automatically the LCM.